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Bond enthalpies to calculate change in enthalpy

Posted: Fri Mar 16, 2018 2:18 pm
by AlyssaPeckham1A
Could someone explain how to use bond enthalpies to calculate the change in enthalpy of a reaction?

Re: Bond enthalpies to calculate change in enthalpy

Posted: Fri Mar 16, 2018 2:37 pm
by Jessica Jones 2B
You would use the (deltaH of bonds broken - deltaH of bonds formed). In order to figure out which bonds are broken and formed you look at the lewis structures. You could just break every bond in reactants and from every bond in the products if that is easier for you.

Re: Bond enthalpies to calculate change in enthalpy

Posted: Sat Jan 26, 2019 1:10 pm
by Eunice Lee 1A
You would need the enthalpy of each bond in the reaction broken and each bond in the reaction formed. Add these values together to get the total change in enthalpy.

Re: Bond enthalpies to calculate change in enthalpy

Posted: Sat Jan 26, 2019 1:17 pm
by Emily Huang 1E
You would determine the change in phases and find the bond enthalpy. You subtract the bond enthalpy of the reactants from the bond enthalpy of the products